This is an Elementor web site and pages design tool.
Let’s check how Elementor behaves. First user trap already found. Copy-paste text from Headings is not possible directly from the preview to on the page’s left. Instead Headings need a mouse pointer click to open Heading Editor on the page’s right, from the small edit box text can be copy-pasted. Well, one catches this software tic quite fast. A first impression could be worse, wouldn’t it?